Improved ore-roaster



(31H. GRIFFIN.

l ORBROASTEB..

m1114369] Patented 0oz, 18, 1864.

UNITED STATES PATENT OFFICE.

C. GRIFFIN, OF CHELSEA, ASSIGNOR TO HIMSELF AND HENRY A. BREED.

OF LYNN, MASSACHUSETTS.

lmPaovED ORE-ROASTEP..

Specification forming part of.' Letters Patent No. 44,709, dated October 1.8, 1864.

yof my invention sufficient to enable those skilled in the art to practice it.

This invention relates to the construction of ovens or furnaces for roasting ores, the improvement consisting in the construction land arrangement of the roasting-pan with reference to the ue of the furnace, and in combiningwith a rotary pan a mechanism for stirring the powdered or crushed ore contained therein.

The object of a roasting apparatus, as is 'well understood, is to desulphurize the ores,

by heating' the1n,.in a subdivided or finelydivided condition, in contact with oxygen',

v thereby Vfreein g the sulphurets.

As my invention, however, does' not relate to the chemical action of heat upon the .ores to desulphurize them, such action need not be further particularly referred to, it being only necessary to remark that in the process of 'roast-ing it is desirable to thoroughly and equally heat the whole mass of ore contained in the roaster without fusing the same', and with my apparatus it is designed to keep the ore while being roasted in a comparatively close vessel, into which, however, air enough is to be admitted to oxidize the ore.

Figure l ot' the drawings represents atop view of my apparatus; Fig. 2, a side elevation ot the same; Fig. 3, a vertical section taken in the line .rw ofFig. 1; Fig;i 4, a front elevation with a part of the apparatus broken away to show the stirrer; Fig. 5, a top view of the furnace and fine.

ct denotes the foundation, upon which is erected a furnace, b, having a fan-blower, c. This-furnace opens into a` shallow circular flue-chamber, d, the heat and other Volatile products ot' combustion passing around the same'in the direction of the arrows (see Fig. 5) and thence into and through the chimney '9. Fitting upon or over this fluechamber is a circular pan or roaster, f, from the center of which rises a vertical shaft, to which rotary motion is imparted'to give a horizontal rotary movement to the pan over the furnace-fine,

,bringing all parts of the surface of the. pan

equally to the action of the heat from the furnace. This pan is surmounted by a stationary cover, g, which is made capable of vertical movement-in guide-posts h. per, i, in this cover, the pan is charged with ore, and a conductor or chute from the apparatus, which pulverizes the ore, may be connected with or led directly into this charginghopper. To remove the roasted and desulphurized ore, the cover gis raised until free access can be had to the interior of the pan f. A rotary shaft, k, passes through the cover g,

as seen in Fig. 4, this shaft being supported in a bearing, l, and in the side of the c' ver. On its inner end it bears one or more r dial arms, m, which in their rotation extend do n\ to or nearly to the bottom of the pan. Rotay motion is given to the shaft and arms in any desirable manner, the arms rotating simultaneously with the movement of the pan, and it will be obvious that the action of the armsin contact with the mass ot' ore will thoroughly turn over and stir up the mass, so as to bring all parts thereof against the heated surface of the pan.

It is intended to use this apparatus principally in the treatment ot' ores which have -been crushed to powder, but it may, of course,

be employed for roasting ores which are less finely divided. A pipe, fn, may lead from the cover g in to or through a tub or cistern, o, containing water, to condense the gases which owthrough the ppe.- The air to oXidize the ore passesin through the joint between the pan and the cover, which Jits suiiiciently loose for this purpose, or a pipe may lead from the roaster through the cover'4 g, as may be desirable. A partition, p, is placed across the flue, dividing the part thereof adjacent to the furnace-opening from that part adjacent to the chimney.

I claiml. The combination of the rotary pan or roaster with the furnaceiiue passing around under the same, substantially as described.

2. In combination with the rotating pan, the rotary arms m, operating in the manner andA for the purpose substantially as set forth.

In testimony` whereof I have hereunto set my signature this 21st day of September, A. D. 1864. i Witnesses:

F. GOULD, J. B. CROSBY.

C. H. GRIFFIN.

Through a hop- 

